1 /* 2 * Copyright (c) 2015, Mellanox Technologies inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include <linux/module.h> 34 #include <linux/configfs.h> 35 #include <rdma/ib_verbs.h> 36 #include <rdma/rdma_cm.h> 37 38 #include "core_priv.h" 39 #include "cma_priv.h" 40 41 struct cma_device; 42 43 struct cma_dev_group; 44 45 struct cma_dev_port_group { 46 unsigned int port_num; 47 struct cma_dev_group *cma_dev_group; 48 struct config_group group; 49 }; 50 51 struct cma_dev_group { 52 char name[IB_DEVICE_NAME_MAX]; 53 struct config_group device_group; 54 struct config_group ports_group; 55 struct cma_dev_port_group *ports; 56 }; 57 58 static struct cma_dev_port_group *to_dev_port_group(struct config_item *item) 59 { 60 struct config_group *group; 61 62 if (!item) 63 return NULL; 64 65 group = container_of(item, struct config_group, cg_item); 66 return container_of(group, struct cma_dev_port_group, group); 67 } 68 69 static bool filter_by_name(struct ib_device *ib_dev, void *cookie) 70 { 71 return !strcmp(dev_name(&ib_dev->dev), cookie); 72 } 73 74 static int cma_configfs_params_get(struct config_item *item, 75 struct cma_device **pcma_dev, 76 struct cma_dev_port_group **pgroup) 77 { 78 struct cma_dev_port_group *group = to_dev_port_group(item); 79 struct cma_device *cma_dev; 80 81 if (!group) 82 return -ENODEV; 83 84 cma_dev = cma_enum_devices_by_ibdev(filter_by_name, 85 group->cma_dev_group->name); 86 if (!cma_dev) 87 return -ENODEV; 88 89 *pcma_dev = cma_dev; 90 *pgroup = group; 91 92 return 0; 93 } 94 95 static void cma_configfs_params_put(struct cma_device *cma_dev) 96 { 97 cma_dev_put(cma_dev); 98 } 99 100 static ssize_t default_roce_mode_show(struct config_item *item, 101 char *buf) 102 { 103 struct cma_device *cma_dev; 104 struct cma_dev_port_group *group; 105 int gid_type; 106 ssize_t ret; 107 108 ret = cma_configfs_params_get(item, &cma_dev, &group); 109 if (ret) 110 return ret; 111 112 gid_type = cma_get_default_gid_type(cma_dev, group->port_num); 113 cma_configfs_params_put(cma_dev); 114 115 if (gid_type < 0) 116 return gid_type; 117 118 return sysfs_emit(buf, "%s\n", ib_cache_gid_type_str(gid_type)); 119 } 120 121 static ssize_t default_roce_mode_store(struct config_item *item, 122 const char *buf, size_t count) 123 { 124 struct cma_device *cma_dev; 125 struct cma_dev_port_group *group; 126 int gid_type; 127 ssize_t ret; 128 129 ret = cma_configfs_params_get(item, &cma_dev, &group); 130 if (ret) 131 return ret; 132 133 gid_type = ib_cache_gid_parse_type_str(buf); 134 if (gid_type < 0) 135 return -EINVAL; 136 137 ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type); 138 139 cma_configfs_params_put(cma_dev); 140 141 return !ret ? strnlen(buf, count) : ret; 142 } 143 144 CONFIGFS_ATTR(, default_roce_mode); 145 146 static ssize_t default_roce_tos_show(struct config_item *item, char *buf) 147 { 148 struct cma_device *cma_dev; 149 struct cma_dev_port_group *group; 150 ssize_t ret; 151 u8 tos; 152 153 ret = cma_configfs_params_get(item, &cma_dev, &group); 154 if (ret) 155 return ret; 156 157 tos = cma_get_default_roce_tos(cma_dev, group->port_num); 158 cma_configfs_params_put(cma_dev); 159 160 return sysfs_emit(buf, "%u\n", tos); 161 } 162 163 static ssize_t default_roce_tos_store(struct config_item *item, 164 const char *buf, size_t count) 165 { 166 struct cma_device *cma_dev; 167 struct cma_dev_port_group *group; 168 ssize_t ret; 169 u8 tos; 170 171 ret = kstrtou8(buf, 0, &tos); 172 if (ret) 173 return ret; 174 175 ret = cma_configfs_params_get(item, &cma_dev, &group); 176 if (ret) 177 return ret; 178 179 ret = cma_set_default_roce_tos(cma_dev, group->port_num, tos); 180 cma_configfs_params_put(cma_dev); 181 182 return ret ? ret : strnlen(buf, count); 183 } 184 185 CONFIGFS_ATTR(, default_roce_tos); 186 187 static struct configfs_attribute *cma_configfs_attributes[] = { 188 &attr_default_roce_mode, 189 &attr_default_roce_tos, 190 NULL, 191 }; 192 193 static const struct config_item_type cma_port_group_type = { 194 .ct_attrs = cma_configfs_attributes, 195 .ct_owner = THIS_MODULE 196 }; 197 198 static int make_cma_ports(struct cma_dev_group *cma_dev_group, 199 struct cma_device *cma_dev) 200 { 201 struct ib_device *ibdev; 202 unsigned int i; 203 unsigned int ports_num; 204 struct cma_dev_port_group *ports; 205 206 ibdev = cma_get_ib_dev(cma_dev); 207 208 if (!ibdev) 209 return -ENODEV; 210 211 ports_num = ibdev->phys_port_cnt; 212 ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports), 213 GFP_KERNEL); 214 215 if (!ports) 216 return -ENOMEM; 217 218 for (i = 0; i < ports_num; i++) { 219 char port_str[10]; 220 221 ports[i].port_num = i + 1; 222 snprintf(port_str, sizeof(port_str), "%u", i + 1); 223 ports[i].cma_dev_group = cma_dev_group; 224 config_group_init_type_name(&ports[i].group, 225 port_str, 226 &cma_port_group_type); 227 configfs_add_default_group(&ports[i].group, 228 &cma_dev_group->ports_group); 229 230 } 231 cma_dev_group->ports = ports; 232 return 0; 233 } 234 235 static void release_cma_dev(struct config_item *item) 236 { 237 struct config_group *group = container_of(item, struct config_group, 238 cg_item); 239 struct cma_dev_group *cma_dev_group = container_of(group, 240 struct cma_dev_group, 241 device_group); 242 243 kfree(cma_dev_group); 244 }; 245 246 static void release_cma_ports_group(struct config_item *item) 247 { 248 struct config_group *group = container_of(item, struct config_group, 249 cg_item); 250 struct cma_dev_group *cma_dev_group = container_of(group, 251 struct cma_dev_group, 252 ports_group); 253 254 kfree(cma_dev_group->ports); 255 cma_dev_group->ports = NULL; 256 }; 257 258 static struct configfs_item_operations cma_ports_item_ops = { 259 .release = release_cma_ports_group 260 }; 261 262 static const struct config_item_type cma_ports_group_type = { 263 .ct_item_ops = &cma_ports_item_ops, 264 .ct_owner = THIS_MODULE 265 }; 266 267 static struct configfs_item_operations cma_device_item_ops = { 268 .release = release_cma_dev 269 }; 270 271 static const struct config_item_type cma_device_group_type = { 272 .ct_item_ops = &cma_device_item_ops, 273 .ct_owner = THIS_MODULE 274 }; 275 276 static struct config_group *make_cma_dev(struct config_group *group, 277 const char *name) 278 { 279 int err = -ENODEV; 280 struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name, 281 (void *)name); 282 struct cma_dev_group *cma_dev_group = NULL; 283 284 if (!cma_dev) 285 goto fail; 286 287 cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL); 288 289 if (!cma_dev_group) { 290 err = -ENOMEM; 291 goto fail; 292 } 293 294 strlcpy(cma_dev_group->name, name, sizeof(cma_dev_group->name)); 295 296 config_group_init_type_name(&cma_dev_group->ports_group, "ports", 297 &cma_ports_group_type); 298 299 err = make_cma_ports(cma_dev_group, cma_dev); 300 if (err) 301 goto fail; 302 303 config_group_init_type_name(&cma_dev_group->device_group, name, 304 &cma_device_group_type); 305 configfs_add_default_group(&cma_dev_group->ports_group, 306 &cma_dev_group->device_group); 307 308 cma_dev_put(cma_dev); 309 return &cma_dev_group->device_group; 310 311 fail: 312 if (cma_dev) 313 cma_dev_put(cma_dev); 314 kfree(cma_dev_group); 315 return ERR_PTR(err); 316 } 317 318 static void drop_cma_dev(struct config_group *cgroup, struct config_item *item) 319 { 320 struct config_group *group = 321 container_of(item, struct config_group, cg_item); 322 struct cma_dev_group *cma_dev_group = 323 container_of(group, struct cma_dev_group, device_group); 324 325 configfs_remove_default_groups(&cma_dev_group->ports_group); 326 configfs_remove_default_groups(&cma_dev_group->device_group); 327 config_item_put(item); 328 } 329 330 static struct configfs_group_operations cma_subsys_group_ops = { 331 .make_group = make_cma_dev, 332 .drop_item = drop_cma_dev, 333 }; 334 335 static const struct config_item_type cma_subsys_type = { 336 .ct_group_ops = &cma_subsys_group_ops, 337 .ct_owner = THIS_MODULE, 338 }; 339 340 static struct configfs_subsystem cma_subsys = { 341 .su_group = { 342 .cg_item = { 343 .ci_namebuf = "rdma_cm", 344 .ci_type = &cma_subsys_type, 345 }, 346 }, 347 }; 348 349 int __init cma_configfs_init(void) 350 { 351 int ret; 352 353 config_group_init(&cma_subsys.su_group); 354 mutex_init(&cma_subsys.su_mutex); 355 ret = configfs_register_subsystem(&cma_subsys); 356 if (ret) 357 mutex_destroy(&cma_subsys.su_mutex); 358 return ret; 359 } 360 361 void __exit cma_configfs_exit(void) 362 { 363 configfs_unregister_subsystem(&cma_subsys); 364 mutex_destroy(&cma_subsys.su_mutex); 365 } 366